Using Insights into Human Rationality to Improve Financial Regulation

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Policy Brief No. 144 — November 2018

Using Insights into Human Rationality to Improve Financial Regulation Steven L. Schwarcz Key Points →→ The limitations of human rationality constrain the efficacy of law. This policy brief examines how insights into human rationality could improve financial regulation. →→ Four categories of limitations — herd behaviour, cognitive biases, overreliance on heuristics and a proclivity to panic — constrain the efficacy of financial regulation by undermining the perfectmarket assumption that parties have full information and will act in their rational self-interest. →→ Regulators could improve financial regulation by addressing these limitations. Since we do not yet fully understand our limitations, even improved regulation will remain imperfect. As a result, future financial failures are inevitable. Financial regulation should be designed to address that inevitability by not only deterring financial crises but also mitigating their harm when they inevitably occur.

Introduction Since the 1970s, the field of behavioural psychology has been exploring limitations on human rationality. Herbert Simon first outlined the theory of “bounded rationality,” which posits that we cannot access and process all the information needed to maximize our benefit. The human mind therefore “necessarily restricts itself ” by relying on cognitive shortcuts.1 Recent studies have shown, however, that these human limitations can sometimes be improved. Legal scholars are now beginning to explore how these studies could inform more effective regulation. This policy brief explores how these studies could inform more effective financial regulation.2 The following section entitled “Categories of Human Limitations” begins by showing that four categories of human limitations can undermine two of the perfect-market assumptions that underlie financial regulation: that parties have full information and that they will act in their rational self-interest.3

1

“Herbert Simon”, The Economist (20 March 2009), online: <www.economist.com/ node/13350892>.

2

This policy brief is based on the author’s article, “Regulating Complacency: Human Limitations and Legal Efficacy” (2018) 93 Notre Dame L Rev 1073.

3

Farlex Financial Dictionary, s.v. “perfect market assumptions”, online: <http://financialdictionary.thefreedictionary.com/Perfect+market+assumptions> (discussing perfectmarket assumptions, including that market participants have equal access to information and are completely rational).


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